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Products>>>Speaker>>>Telephone speaker       Diameter:           Cone Material: Edge: Nominal Power: Maximum Power: Impedance:   Voice coil: Fo: Response: S.P.L: Magnet Size: Net weight:       Φ50mm       Paper       Paper       0.25w           0.5w           8±15%Ω       Φ13.3mm       450±20%Hz       Fo-4kHz       82±3dB/W/M       Φ12×2(NdFeB)       30g